Mark Scheme (Results)

Mark Scheme (Results)

Pearson Edexcel Additional Sample Assessment Materials GCSE 9-1 Combined Science Paper 1: Biology 1 1SC0/1BF

First examination 2017

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General Marking Guidance

All candidates must receive the same treatment. Examiners must mark the first candidate in exactly the same way as they mark the last.

Mark schemes should be applied positively. Candidates must be rewarded for what they have shown they can do rather than penalised for omissions.

Examiners should mark according to the mark scheme not according to their perception of where the grade boundaries may lie.

There is no ceiling on achievement. All marks on the mark scheme should be used appropriately.

All the marks on the mark scheme are designed to be awarded. Examiners should always award full marks if deserved, i.e. if the answer matches the mark scheme. Examiners should also be prepared to award zero marks if the candidate's response is not worthy of credit according to the mark scheme.

Where some judgement is required, mark schemes will provide the principles by which marks will be awarded and exemplification may be limited.

When examiners are in doubt regarding the application of the mark scheme to a candidate's response, the team leader must be consulted.

Crossed out work should be marked UNLESS the candidate has replaced it with an alternative response.

Paper 1F Biology Foundation Additional SAMs Combined Science

Question Answer

number

1(a)

C

Mark (1)

Question Answer number 1(b)

pathogens (1)

antibiotics (1)

viruses (1)

Mark (3)

Question number 1(c)

Answer

An answer that combines knowledge (1 mark) and understanding (2 marks) to provide a logical description:

Mark

white blood cells (1) (3)

produce antibodies (1) memory lymphocytes/cells produced (that provide

immunity) (1)

Total for question 1 = 7 marks

Question number 2(a)

Answer

pH heading in one column (1) Time in minutes heading in separate column (1) Correct range of pH values under heading pH (1)

Additional guidance

Mark

Full marks for table

with two rows or

columns, one for pH

(with values) and

(3)

other for time in

minutes.

Question number 2(b)

Answer

An explanation that combines identification via a judgement (1 mark) to reach a conclusion via reasoning (1 mark):

Additional guidance Mark (2)

Milk will turn colourless more quickly at pH8 (1)

As this is nearest to the optimum pH for trypsin (1)

Accept other correct data

Question Answer

number

2(c)

B

Mark (1)

Question number 2(d)(i)

Answer

An answer between 35oC and 40oC

Additional guidance Mark

Ignore `body temperature'

(1)

Question Answer

number

2(d) (ii)

(thermostatically controlled) water bath / incubator

Mark (1)

Total for question 2 = 8 marks

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